JPH0519627U - Washer seal - Google Patents

Abstract

(57) [Abstract] [Purpose] A semi-permanent repulsive force and a sealing force are obtained by applying elastic repulsive force to the cover member by double means. [Structure] A metal reinforcing ring (1) and a seal portion (2) are formed, and a spring ring (3) formed of a spring material is embedded in the seal portion (2).

Description

[Detailed description of the device]

[000l]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a washer seal used with a fixture for mounting a cover member, and more particularly to a washer seal having sealing property and elasticity.

[0002]

[Prior Art]

 Conventionally, fasteners such as bolts and nuts for fastening engine cover members, such as rocker covers and oil pans, have been used with washer seals made of an elastic body that has both sealing force and elastic force. With this washer seal, an elastic tightening force is applied to the cover gasket that seals the hole portion through which the fastener is passed and seals the cover member. The general structure of such a washer seal is to evenly transmit the tightening pressure to a wide area and to prevent the nuts from directly contacting with each other so that they do not rotate together. Washer seals with a reinforcing ring made of steel are often used.

[0003]

[Problems to be solved by the device]

 However, as described above, such a washer seal tightens the gasket that covers the entire circumference of the cover member from a plurality of important points, so that the load per unit area becomes large and the compressive deformation is inevitably limited. Therefore, cracks and fractures due to compressive fatigue tend to occur in the seal portion of the elastic body at an early stage, and the elastic repulsion force is easily lost. In addition, there is a major drawback that must be solved, such as the compression set of the elastic body caused by the heat load, which causes leakage due to the decrease in bolt axial force.

A detailed description will be given below with reference to the drawings. In order to eliminate this drawback, as shown in FIG. 5, a structure in which the outer peripheral portion of the metal reinforcing ring (1) is drooped (11) largely to restrict the lateral length of the seal portion (2), or A structure in which a cylindrical ring (12) is formed and is fitted to the outer periphery of the seal portion (2) to suppress the compression deformation from the outer peripheral surface to provide durability as shown in 6, is also proposed. If the amount of deformation is suppressed, it is natural that the original elasticity of the seal part (2) is greatly lost, and the vibration absorption force becomes extremely weak, resulting in excessive tightening force and resonance of the cover member. And even worse. The purpose of the present invention is to eliminate such drawbacks and to provide a washer seal that achieves high sealing force and durability by performing strong tightening while retaining the rich repulsive force of the elastic body.

[0005]

[Means for Solving the Problems]

 The present invention, as shown in FIG. 1, includes a metal-made reinforcing ring (1) having sufficient rigidity, and a synthetic rubber or synthetic resin integrally bonded to the lower part of the metal-made reinforcing ring (1). A washer seal (A) formed with a seal portion (2) made of an elastic material, wherein a spring ring (3) having a cross section of substantially <shaped inside the seal portion (2) and formed of a spring material. It is characterized by being buried.

Further, the spring ring (3) is characterized in that a chrysanthemum spring ring (31) is formed by cutting out the peripheral edge at a plurality of locations.

[0007]

[Action]

 The present invention has the above-described structure and exhibits the following excellent effects. That is, as shown in FIG. 4, the washer seal (A) attached to the cover member (B) together with the bolt (C) is tightened by the upper and lower members (B) and (C) so that the seal portion (2) is strong. It receives compressive force and begins elastic deformation. Then, the tightening force is applied to the spring ring (3) included in the seal portion (2), and the spring ring (3) is gradually compressed to gradually increase the impact resilience. After that, the tightening force is increased by the seal portion (2) and the spring ring (3), and the tightening work is completed.

[0008] In this state, the washer seal (A) has stopped the tightening work due to the strong repulsive elastic force of the spring ring (3), so that the seal portion (2) inside has a proper tightening force. It is compressed and therefore released from compression set leaving a margin for its elastic force. This spring ring (3) exerts a semi-permanent elastic repulsive force unless it is subjected to a limit deformation, and the repulsive action of this and the seal portion (2) directs a strong elastic repulsive force to the cover member (B). ..

[0009]

【Example】

 In carrying out the present invention, the spring ring (3) included in the seal portion (2) is shown in the drawing as a substantially <shape that gradually expands in the outer peripheral direction. However, it is not a one-sided hindrance, and it is also possible to make the shape a ⊂ shape. Further, as shown in FIGS. 2 and 3, if the peripheral edge of the spring ring (3) is cut out at a plurality of positions to form a chrysanthemum spring ring (31), a flexible elastic coefficient can be obtained for the purpose of adjusting the thickness. Thus, the optimum elastic force required can be provided.

[0010]

[Effect of the device]

 As described above, the present invention does not lose the flexibility even with strong tightening and maintains a strong rebound resilience over a long period of time. Therefore, vibration and heat load of the rocker cover or oil pan of the engine, etc. This is a washer seal that exhibits ideal functions such as showing excellent vibration absorption and sealing power in areas with strong vibration.

[0011]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a washer seal of the present invention.

FIG. 2 is a sectional view of another embodiment of the present invention.

[Figure 3]

FIG. 3 is a plan view of FIG.

FIG. 4 is a cross-sectional view showing an implementation state of the present invention.

FIG. 5 is a cross-sectional view showing a conventional structure without using the present invention.

FIG. 6 is a cross-sectional view showing another conventional structure.

[Explanation of symbols]

 A washer seal B cover member C bolt 1 metal reinforcing ring 2 seal part 3 spring ring 31 chrysanthemum spring ring

Claims (2)

[Scope of utility model registration request] 1. A washer seal (A) comprising a metal reinforcing ring (1) and an elastic seal portion (2) integrally connected to the lower part of the metal reinforcing ring (1); A washer seal characterized in that a spring ring (3) having a substantially <-shaped cross section and formed of a spring material is embedded inside the seal portion (2). 2. The washer seal according to claim 1, wherein the spring ring (3) has a chrysanthemum spring ring (31) having a plurality of cutouts at the peripheral edge thereof.